We've admired cement tiles in the past (from Popham and Granada Tile, for instance), but we're especially taken with the newly expanded Promenade line of cement tiles from Waterworks. According to Barbara Sallick of Waterworks, "The tiles are made from a combination of natural materials such as crushed limestone, aggregate, sand, and water. Each batch requires the skill of as many as 27 artisans, who press the tile, submerge it in water, layer on the mineral pigment with metal mods, and set it out to air dry for up to three weeks."